Move optional.h to webrtc/api/

webrtc/modules/audio_coding/neteq/tools/neteq_delay_analyzer.h

 /*
  *  Copyright (c) 2017 The WebRTC project authors. All Rights Reserved.
  *
  *  Use of this source code is governed by a BSD-style license
  *  that can be found in the LICENSE file in the root of the source
  *  tree. An additional intellectual property rights grant can be found
  *  in the file PATENTS.  All contributing project authors may
  *  be found in the AUTHORS file in the root of the source tree.
  */
 
 #ifndef WEBRTC_MODULES_AUDIO_CODING_NETEQ_TOOLS_NETEQ_DELAY_ANALYZER_H_
 #define WEBRTC_MODULES_AUDIO_CODING_NETEQ_TOOLS_NETEQ_DELAY_ANALYZER_H_
 
 #include <map>
 #include <set>
 #include <string>
 #include <vector>
 
+#include "webrtc/api/optional.h"
 #include "webrtc/modules/audio_coding/neteq/tools/neteq_input.h"
 #include "webrtc/modules/audio_coding/neteq/tools/neteq_test.h"
-#include "webrtc/rtc_base/optional.h"
 #include "webrtc/typedefs.h"
 
 namespace webrtc {
 namespace test {
 
 class NetEqDelayAnalyzer : public test::NetEqPostInsertPacket,
                            public test::NetEqGetAudioCallback {
  public:
   void AfterInsertPacket(const test::NetEqInput::PacketData& packet,
                          NetEq* neteq) override;
@@ skipping 30 matching lines @@
   size_t get_audio_count_ = 0;
   size_t last_sync_buffer_ms_ = 0;
   int last_sample_rate_hz_ = 0;
   std::set<uint32_t> ssrcs_;
   std::set<int> payload_types_;
 };
 
 }  // namespace test
 }  // namespace webrtc
 #endif  // WEBRTC_MODULES_AUDIO_CODING_NETEQ_TOOLS_NETEQ_DELAY_ANALYZER_H_